Socket detected 84 compromised TanStack npm package artifacts modified with credential-stealing malware targeting CI systems, including GitHub Actions. Affected packages like @tanstack/react-router have over 12 million weekly downloads. The malicious versions contain router_init.js, a heavily obfuscated file with daemonization capabilities and environment variable access for GitHub Actions secrets. The compromise exploited GitHub Actions cache poisoning and pull_request_target patterns to extract OIDC tokens and authenticate malicious npm publishes through trusted-publisher bindings. The malware harvests credentials from GitHub Actions, AWS (IMDS, Secrets Manager, SSM), HashiCorp Vault, and Kubernetes, while establishing persistence in Claude Code and VS Code directories. Exfiltration occurs through Session's decentralized P2P network. The campaign includes self-propagation mechanisms that steal npm OIDC tokens and autonomously republish compromised packages. Updates indicate expansion to OpenSearch, Mistr...